implement a staging area

Implement a staging area outside the normal datastructure.

This is need to show vehicles and personnel that is in
a state of alert, where it can be put to work, but has
nothing to do yet.
These personnel usually is located somewhere in the
near vicinity of a disaster where they stand ready to
move in.

goals:
- allow the user to easily add new units to the staging
area (like when he is told, that a new ambulance has
arrived he will put it in the staging area first)
- allow the user to get a quick overview of what units
he still has in the staging area (like say 20
ambulances, 20 engines of the fire brigade etc)
- allow the user to quickly dispatch those units into
the disaster areas (use Drag & Drop)

this should be accomplishable by using the docking VS
Style Toolbar provided with the MedicLibs